Segments Are Voltages And Intervals Are Times

The student should distinguish between segments and intervals in the ECG tracing. A segment refers to a part of the ECG where the tracing is expected to be relatively flat and is measured in terms of voltage (its vertical position). Intervals indicate time periods and are measured in seconds on the horizontal scale. For example, the ST segment is the flat region after the end of the QRS complex and the start of the T wave. It is normally at the same voltage as the baseline. The QT interval is defined as the time interval between the beginning of the QRS complex and the end of the T wave. It is typically about 0.3-0.4 sec in duration. The R-R interval is the time interval between

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